Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6694866 | High output spring brake actuator | Michael D. Stubblefield | 2004-02-24 |
| 6405635 | Brake actuator | Greg Smith, Ralph D. Russell, Michael D. Stubblefield | 2002-06-18 |
| 6378414 | Removable filter cap for spring brake actuator | Savvas Constantinides | 2002-04-30 |
| 6314861 | High output spring brake actuator | Michael D. Stubblefield | 2001-11-13 |
| 6131501 | Brake actuator and method of manufacture | Ralph D. Russell, Michael D. Stubblefield | 2000-10-17 |
| 6129004 | Brake actuator and method of manufacture | Ralph D. Russell, Michael D. Stubblefield | 2000-10-10 |
| 5829339 | Crimped sealed adapter bushing assembly for a double diaphragm spring brake actuator | — | 1998-11-03 |
| 5758564 | Brake actuator and method of manufacture | Ralph D. Russell, Michael D. Stubblefield | 1998-06-02 |
| 4443421 | Process for removing particulate impurities from aqueous phosphoric acid | Charles M. Hollifield | 1984-04-17 |